Furnace-roof.



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FURNAGE -BOQE To all "whom; concern:

B e i t knqwn that L'WILLIA SLnro'HER, j acit zen of the. United States, residing at ;Troy," of Rensselaer', and' State of New Yorkl flhave invented certain new and useful 'l mpro ve ments in Furnace-Roofs; and

I do here jr fdeclare the following to be a full, clear, an act descri tionof the invention, such as enable others skilled in the art to-which it appertains to make and use the same. I

. The object'of the invention is to improve the construction of furnace roofs, orroof'por- 'tions, made up of a metallicfra'me or bung lined with, or sup orting, a facing of refractory material to c ose the whole or a ortion of the furnace top, and more'particularly to provide a device of this ty e in which the reactory lining may'read' y be removed or replaced, or its supporting mechanism may be adjusted to take up) wear and, at the same time, provision may e made for the differ ent coeflicients of expansion of the metal parts and the refractory material, so that the refractory material, is securely held in place at all temperatures. f v

- 4 The mechanism by which this object is accomplished will be understood from the following description and the accompanying 3Q drawing. V

4 In the drawing, Figure 1 is an elevation of the complete roof portion illustrating the improvements in their preferred form; Fig.

' 2 is an .elevation of one end of the roof portion on a larger scale; Fig. 3 is a top plan view of the same; Fig. 4 is an end elevation of thesaine; and Fig. 5 is an end elevation of the metallic portion of the frame with the retaining devices removed.-

40 The roof portion is made up of an arched metallic frame, which may be made of the shape-in. cross section shown in'Fig. 5, so that it has a' flat foot portion a against which the refractory material is held, and a stiffening rib portion a. The refractory material is preferably made up of a series of bricks b which are held against the arched under-surface ofthe metallic frame by the lever clamps c, pivoted to the ends of the stiffening rib a just above" the foot portion a of the metallic frame. ,-.Near each end of the stiffening rib a is formed an upstanding lug d having'an opening adapted to receive one end of a pin 0, the other end of which rests in a bhnd socket in the up or end of the lever arm 0 of the clamp c and is pivotally secured therein by a split onto the teri Speeification'oi'iietters Patent. Bater ted na 14; 19 081, i Application and February 26,1908.L s mi-no. 417,3; i a

the pm emside of the lever. arm cf is a-nut forming an enlargement of -the pin, and between this nut and the upstanding lug (Meta coiled'springg which servesfto-normally lie.

pressoutward the-upper end of the levenatai 4 c. In the arm 0 between itspivot' anrbit$f-"=- upper end is an internallyscrew-threaded boss into which is screwed 'a'setscrewilt;1til}a inner -end of which rests, in an elon' t; socket lc-onJt-he end of the stiffening a. This set screw serves as an adjusta I spacing "member between the lever of the-p'voted cl amp 'and the end.,. of;t11e stiffening flange of." 4 3 1 sired to t a lining to the under surface Of the metal frame,.a series of bricks of; refractory materialare laid on edge ,along ='the'under surface ofthe footpiece a between thejclamps The "operation is as follows When 1s;-

, time his c and when-this series of bricks h isbeen-com- V ,pleted fron'i'ene end of the frame. to.the other, the. setscrews h are turned until they engage their sockets and until by their movement the clamps are turned on their pivots to tightly clam the refractory lining in place, so that the ining is positivel held by the clamps,which, on account of t e set screws, have no capacity for turning on their ivots in such a direction as to loosen the liricks constituting the lining. It will be understood that when this operation is performed the metallic frame is in a relatively cool state. When the roof portion has thus been completed, it is placed in proper position on the furnace and as it heats up the metal will expand, the coefiicient of expansion of the metal being considerably greater than that of the'refractory material, which. may even have a negative coefficient of ex ansion, so that it cmtracts. with the heat. The expansion of the metal frame will elongate it so that the points at'which the clamps are pivoted move in a direction to loosen the bricks which have not expanded to so great an extent. When this takes place the spring comes into'play and by'its expansion turns the clamp on its pivot and holds the clamping face tightly against the end of the brick. Upon the cooling of the roof portion the metal contracts toits ori inal dimensions and the parts assume their original positions, the ends of the set screws again engaging their-sockets.

It will be observed that by this construction the lining of refractory material is posi- .go'lc amping action on t by the meni g s-mg mifieeis nd. he spring is m no we. depended uponfor that,

purpose. It is o y when the 'metal expands to a greater extent than the refractory. 5 terial that the spring -'-any.--efiect"at $11.3 The result is that thefielta" 4 entirely reliable "and yet have s I bilit to .com 'nsatefelth'difieren, eo'e ,cients expansiq ofthe' .tw

1o which the roof port o ad What I claim is:

1. A furnace roofmember a metal lic frame, a Iever clamp pivoted theretojand having a depending member adapted to f clamp a facing of refractory 1 naterial be l flneath, the metallic frame, andaspring c0? z acting with the lever armfto force the de- 7 pending member 'of" the clampxyieldingilly ainst. the refi'actorl}; material, whereby t e e refractory. inaterialis -automat1cally maintained as. the frame ex-.

. ;"=-pands in combination with al -supplemental adjustable and nnyield' of t e clampiintoclam stantiall as'described" w e 2. A v nace roofmembeiyhaving' anr pesition; subarched metallic frame, eleven-clamp pivoted to each end thereof,-each 'lever-clamp having :;o a depending member to-clamp between them an archedbodgofrefractorymaterial,as ring 'co-actingfwit ;.the lever of'ea'ch amp paciiijg member for ositive ly .fercing the ependiiig -member ee'aloai' trade-15am" m'ember v i m i gt action en-thei-refr ct q y a i t, is eumjmaiica gm nt ail-the P ne memb mexnber into clamping member new metallic'frame, of a' Iever sha es P alev'era e,"pivoted t'o eachje'ndof the metheni Ian arched body-of refractori material, a se't-screwh pass' thro h' eac lever arm the meta depend -memb'ers into clamping pos tion, and'a 00' ed eprin g, supported betweenthe ,upper end of each eve '-arm and a'fixed abutment on the metallic frame for causing the clamp for positively and 'en'gafiing a soc e tgi'nt 0 adjacent end of c frame. forpositively forcing the dfi'pending members of the clamps'to retain t e refractorg material as the metallic framerefractory-material, whereby. the;

matienwi th ai'supplemental t me a dependingmember ea'nd 45 tallic frame and adapted to clamp between 

